net/ipv6/af_inet6.c - android_kernel_oneplus_msm8996 - Gitiles

 /*
  *	PF_INET6 socket protocol family
  *	Linux INET6 implementation
  *
  *	Authors:
  *	Pedro Roque		<roque@di.fc.ul.pt>
  *
  *	Adapted from linux/net/ipv4/af_inet.c
  *
  *	$Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
  *
  * 	Fixes:
  *	piggy, Karl Knutson	:	Socket protocol table
  * 	Hideaki YOSHIFUJI	:	sin6_scope_id support
  * 	Arnaldo Melo		: 	check proc_net_create return, cleanups
  *
  *	This program is free software; you can redistribute it and/or
  *      modify it under the terms of the GNU General Public License
  *      as published by the Free Software Foundation; either version
  *      2 of the License, or (at your option) any later version.
  */


 #include <linux/module.h>
 #include <linux/config.h>
 #include <linux/errno.h>
 #include <linux/types.h>
 #include <linux/socket.h>
 #include <linux/in.h>
 #include <linux/kernel.h>
 #include <linux/sched.h>
 #include <linux/timer.h>
 #include <linux/string.h>
 #include <linux/sockios.h>
 #include <linux/net.h>
 #include <linux/fcntl.h>
 #include <linux/mm.h>
 #include <linux/interrupt.h>
 #include <linux/proc_fs.h>
 #include <linux/stat.h>
 #include <linux/init.h>

 #include <linux/inet.h>
 #include <linux/netdevice.h>
 #include <linux/icmpv6.h>
 #include <linux/smp_lock.h>

 #include <net/ip.h>
 #include <net/ipv6.h>
 #include <net/udp.h>
 #include <net/tcp.h>
 #include <net/ipip.h>
 #include <net/protocol.h>
 #include <net/inet_common.h>
 #include <net/transp_v6.h>
 #include <net/ip6_route.h>
 #include <net/addrconf.h>
 #ifdef CONFIG_IPV6_TUNNEL
 #include <net/ip6_tunnel.h>
 #endif

 #include <asm/uaccess.h>
 #include <asm/system.h>

 MODULE_AUTHOR("Cast of dozens");
 MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
 MODULE_LICENSE("GPL");

 /* IPv6 procfs goodies... */

 #ifdef CONFIG_PROC_FS
 extern int raw6_proc_init(void);
 extern void raw6_proc_exit(void);
 extern int tcp6_proc_init(void);
 extern void tcp6_proc_exit(void);
 extern int udp6_proc_init(void);
 extern void udp6_proc_exit(void);
 extern int ipv6_misc_proc_init(void);
 extern void ipv6_misc_proc_exit(void);
 extern int ac6_proc_init(void);
 extern void ac6_proc_exit(void);
 extern int if6_proc_init(void);
 extern void if6_proc_exit(void);
 #endif

 int sysctl_ipv6_bindv6only;

 #ifdef INET_REFCNT_DEBUG
 atomic_t inet6_sock_nr;
 EXPORT_SYMBOL(inet6_sock_nr);
 #endif

 /* The inetsw table contains everything that inet_create needs to
  * build a new socket.
  */
 static struct list_head inetsw6[SOCK_MAX];
 static DEFINE_SPINLOCK(inetsw6_lock);

 static void inet6_sock_destruct(struct sock *sk)
 {
 	inet_sock_destruct(sk);

 #ifdef INET_REFCNT_DEBUG
 	atomic_dec(&inet6_sock_nr);
 #endif
 }

 static __inline__ struct ipv6_pinfo *inet6_sk_generic(struct sock *sk)
 {
 	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);

 	return (struct ipv6_pinfo *)(((u8 *)sk) + offset);
 }

 static int inet6_create(struct socket *sock, int protocol)
 {
 	struct inet_sock *inet;
 	struct ipv6_pinfo *np;
 	struct sock *sk;
 	struct list_head *p;
 	struct inet_protosw *answer;
 	struct proto *answer_prot;
 	unsigned char answer_flags;
 	char answer_no_check;
 	int rc;

 	/* Look for the requested type/protocol pair. */
 	answer = NULL;
 	rcu_read_lock();
 	list_for_each_rcu(p, &inetsw6[sock->type]) {
 		answer = list_entry(p, struct inet_protosw, list);

 		/* Check the non-wild match. */
 		if (protocol == answer->protocol) {
 			if (protocol != IPPROTO_IP)
 				break;
 		} else {
 			/* Check for the two wild cases. */
 			if (IPPROTO_IP == protocol) {
 				protocol = answer->protocol;
 				break;
 			}
 			if (IPPROTO_IP == answer->protocol)
 				break;
 		}
 		answer = NULL;
 	}

 	rc = -ESOCKTNOSUPPORT;
 	if (!answer)
 		goto out_rcu_unlock;
 	rc = -EPERM;
 	if (answer->capability > 0 && !capable(answer->capability))
 		goto out_rcu_unlock;
 	rc = -EPROTONOSUPPORT;
 	if (!protocol)
 		goto out_rcu_unlock;

 	sock->ops = answer->ops;

 	answer_prot = answer->prot;
 	answer_no_check = answer->no_check;
 	answer_flags = answer->flags;
 	rcu_read_unlock();

 	BUG_TRAP(answer_prot->slab != NULL);

 	rc = -ENOBUFS;
 	sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
 	if (sk == NULL)
 		goto out;

 	sock_init_data(sock, sk);

 	rc = 0;
 	sk->sk_no_check = answer_no_check;
 	if (INET_PROTOSW_REUSE & answer_flags)
 		sk->sk_reuse = 1;

 	inet = inet_sk(sk);

 	if (SOCK_RAW == sock->type) {
 		inet->num = protocol;
 		if (IPPROTO_RAW == protocol)
 			inet->hdrincl = 1;
 	}

 	sk->sk_destruct		= inet6_sock_destruct;
 	sk->sk_family		= PF_INET6;
 	sk->sk_protocol		= protocol;

 	sk->sk_backlog_rcv	= answer->prot->backlog_rcv;

 	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
 	np->hop_limit	= -1;
 	np->mcast_hops	= -1;
 	np->mc_loop	= 1;
 	np->pmtudisc	= IPV6_PMTUDISC_WANT;
 	np->ipv6only	= sysctl_ipv6_bindv6only;

 	/* Init the ipv4 part of the socket since we can have sockets
 	 * using v6 API for ipv4.
 	 */
 	inet->uc_ttl	= -1;

 	inet->mc_loop	= 1;
 	inet->mc_ttl	= 1;
 	inet->mc_index	= 0;
 	inet->mc_list	= NULL;

 	if (ipv4_config.no_pmtu_disc)
 		inet->pmtudisc = IP_PMTUDISC_DONT;
 	else
 		inet->pmtudisc = IP_PMTUDISC_WANT;


 #ifdef INET_REFCNT_DEBUG
 	atomic_inc(&inet6_sock_nr);
 	atomic_inc(&inet_sock_nr);
 #endif
 	if (inet->num) {
 		/* It assumes that any protocol which allows
 		 * the user to assign a number at socket
 		 * creation time automatically shares.
 		 */
 		inet->sport = ntohs(inet->num);
 		sk->sk_prot->hash(sk);
 	}
 	if (sk->sk_prot->init) {
 		rc = sk->sk_prot->init(sk);
 		if (rc) {
 			sk_common_release(sk);
 			goto out;
 		}
 	}
 out:
 	return rc;
 out_rcu_unlock:
 	rcu_read_unlock();
 	goto out;
 }


 /* bind for INET6 API */
 int inet6_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
 {
 	struct sockaddr_in6 *addr=(struct sockaddr_in6 *)uaddr;
 	struct sock *sk = sock->sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	__u32 v4addr = 0;
 	unsigned short snum;
 	int addr_type = 0;
 	int err = 0;

 	/* If the socket has its own bind function then use it. */
 	if (sk->sk_prot->bind)
 		return sk->sk_prot->bind(sk, uaddr, addr_len);

 	if (addr_len < SIN6_LEN_RFC2133)
 		return -EINVAL;
 	addr_type = ipv6_addr_type(&addr->sin6_addr);
 	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
 		return -EINVAL;

 	snum = ntohs(addr->sin6_port);
 	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
 		return -EACCES;

 	lock_sock(sk);

 	/* Check these errors (active socket, double bind). */
 	if (sk->sk_state != TCP_CLOSE || inet->num) {
 		err = -EINVAL;
 		goto out;
 	}

 	/* Check if the address belongs to the host. */
 	if (addr_type == IPV6_ADDR_MAPPED) {
 		v4addr = addr->sin6_addr.s6_addr32[3];
 		if (inet_addr_type(v4addr) != RTN_LOCAL) {
 			err = -EADDRNOTAVAIL;
 			goto out;
 		}
 	} else {
 		if (addr_type != IPV6_ADDR_ANY) {
 			struct net_device *dev = NULL;

 			if (addr_type & IPV6_ADDR_LINKLOCAL) {
 				if (addr_len >= sizeof(struct sockaddr_in6) &&
 				    addr->sin6_scope_id) {
 					/* Override any existing binding, if another one
 					 * is supplied by user.
 					 */
 					sk->sk_bound_dev_if = addr->sin6_scope_id;
 				}

 				/* Binding to link-local address requires an interface */
 				if (!sk->sk_bound_dev_if) {
 					err = -EINVAL;
 					goto out;
 				}
 				dev = dev_get_by_index(sk->sk_bound_dev_if);
 				if (!dev) {
 					err = -ENODEV;
 					goto out;
 				}
 			}

 			/* ipv4 addr of the socket is invalid.  Only the
 			 * unspecified and mapped address have a v4 equivalent.
 			 */
 			v4addr = LOOPBACK4_IPV6;
 			if (!(addr_type & IPV6_ADDR_MULTICAST))	{
 				if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
 					if (dev)
 						dev_put(dev);
 					err = -EADDRNOTAVAIL;
 					goto out;
 				}
 			}
 			if (dev)
 				dev_put(dev);
 		}
 	}

 	inet->rcv_saddr = v4addr;
 	inet->saddr = v4addr;

 	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);

 	if (!(addr_type & IPV6_ADDR_MULTICAST))
 		ipv6_addr_copy(&np->saddr, &addr->sin6_addr);

 	/* Make sure we are allowed to bind here. */
 	if (sk->sk_prot->get_port(sk, snum)) {
 		inet_reset_saddr(sk);
 		err = -EADDRINUSE;
 		goto out;
 	}

 	if (addr_type != IPV6_ADDR_ANY)
 		sk->sk_userlocks |= SOCK_BINDADDR_LOCK;
 	if (snum)
 		sk->sk_userlocks |= SOCK_BINDPORT_LOCK;
 	inet->sport = ntohs(inet->num);
 	inet->dport = 0;
 	inet->daddr = 0;
 out:
 	release_sock(sk);
 	return err;
 }

 int inet6_release(struct socket *sock)
 {
 	struct sock *sk = sock->sk;

 	if (sk == NULL)
 		return -EINVAL;

 	/* Free mc lists */
 	ipv6_sock_mc_close(sk);

 	/* Free ac lists */
 	ipv6_sock_ac_close(sk);

 	return inet_release(sock);
 }

 int inet6_destroy_sock(struct sock *sk)
 {
 	struct ipv6_pinfo *np = inet6_sk(sk);
 	struct sk_buff *skb;
 	struct ipv6_txoptions *opt;

 	/*
 	 *	Release destination entry
 	 */

 	sk_dst_reset(sk);

 	/* Release rx options */

 	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
 		kfree_skb(skb);

 	/* Free flowlabels */
 	fl6_free_socklist(sk);

 	/* Free tx options */

 	if ((opt = xchg(&np->opt, NULL)) != NULL)
 		sock_kfree_s(sk, opt, opt->tot_len);

 	return 0;
 }

 /*
  *	This does both peername and sockname.
  */

 int inet6_getname(struct socket *sock, struct sockaddr *uaddr,
 		 int *uaddr_len, int peer)
 {
 	struct sockaddr_in6 *sin=(struct sockaddr_in6 *)uaddr;
 	struct sock *sk = sock->sk;
 	struct inet_sock *inet = inet_sk(sk);
 	struct ipv6_pinfo *np = inet6_sk(sk);

 	sin->sin6_family = AF_INET6;
 	sin->sin6_flowinfo = 0;
 	sin->sin6_scope_id = 0;
 	if (peer) {
 		if (!inet->dport)
 			return -ENOTCONN;
 		if (((1 << sk->sk_state) & (TCPF_CLOSE | TCPF_SYN_SENT)) &&
 		    peer == 1)
 			return -ENOTCONN;
 		sin->sin6_port = inet->dport;
 		ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
 		if (np->sndflow)
 			sin->sin6_flowinfo = np->flow_label;
 	} else {
 		if (ipv6_addr_any(&np->rcv_saddr))
 			ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
 		else
 			ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);

 		sin->sin6_port = inet->sport;
 	}
 	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
 		sin->sin6_scope_id = sk->sk_bound_dev_if;
 	*uaddr_len = sizeof(*sin);
 	return(0);
 }

 int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
 {
 	struct sock *sk = sock->sk;
 	int err = -EINVAL;

 	switch(cmd)
 	{
 	case SIOCGSTAMP:
 		return sock_get_timestamp(sk, (struct timeval __user *)arg);

 	case SIOCADDRT:
 	case SIOCDELRT:

 		return(ipv6_route_ioctl(cmd,(void __user *)arg));

 	case SIOCSIFADDR:
 		return addrconf_add_ifaddr((void __user *) arg);
 	case SIOCDIFADDR:
 		return addrconf_del_ifaddr((void __user *) arg);
 	case SIOCSIFDSTADDR:
 		return addrconf_set_dstaddr((void __user *) arg);
 	default:
 		if (!sk->sk_prot->ioctl ||
 		    (err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
 			return(dev_ioctl(cmd,(void __user *) arg));
 		return err;
 	}
 	/*NOTREACHED*/
 	return(0);
 }

 struct proto_ops inet6_stream_ops = {
 	.family =	PF_INET6,
 	.owner =	THIS_MODULE,
 	.release =	inet6_release,
 	.bind =		inet6_bind,
 	.connect =	inet_stream_connect,		/* ok		*/
 	.socketpair =	sock_no_socketpair,		/* a do nothing	*/
 	.accept =	inet_accept,			/* ok		*/
 	.getname =	inet6_getname,
 	.poll =		tcp_poll,			/* ok		*/
 	.ioctl =	inet6_ioctl,			/* must change  */
 	.listen =	inet_listen,			/* ok		*/
 	.shutdown =	inet_shutdown,			/* ok		*/
 	.setsockopt =	sock_common_setsockopt,		/* ok		*/
 	.getsockopt =	sock_common_getsockopt,		/* ok		*/
 	.sendmsg =	inet_sendmsg,			/* ok		*/
 	.recvmsg =	sock_common_recvmsg,		/* ok		*/
 	.mmap =		sock_no_mmap,
 	.sendpage =	tcp_sendpage
 };

 struct proto_ops inet6_dgram_ops = {
 	.family =	PF_INET6,
 	.owner =	THIS_MODULE,
 	.release =	inet6_release,
 	.bind =		inet6_bind,
 	.connect =	inet_dgram_connect,		/* ok		*/
 	.socketpair =	sock_no_socketpair,		/* a do nothing	*/
 	.accept =	sock_no_accept,			/* a do nothing	*/
 	.getname =	inet6_getname,
 	.poll =		udp_poll,			/* ok		*/
 	.ioctl =	inet6_ioctl,			/* must change  */
 	.listen =	sock_no_listen,			/* ok		*/
 	.shutdown =	inet_shutdown,			/* ok		*/
 	.setsockopt =	sock_common_setsockopt,		/* ok		*/
 	.getsockopt =	sock_common_getsockopt,		/* ok		*/
 	.sendmsg =	inet_sendmsg,			/* ok		*/
 	.recvmsg =	sock_common_recvmsg,		/* ok		*/
 	.mmap =		sock_no_mmap,
 	.sendpage =	sock_no_sendpage,
 };

 static struct net_proto_family inet6_family_ops = {
 	.family = PF_INET6,
 	.create = inet6_create,
 	.owner	= THIS_MODULE,
 };

 #ifdef CONFIG_SYSCTL
 extern void ipv6_sysctl_register(void);
 extern void ipv6_sysctl_unregister(void);
 #endif

 /* Same as inet6_dgram_ops, sans udp_poll.  */
 static struct proto_ops inet6_sockraw_ops = {
 	.family =	PF_INET6,
 	.owner =	THIS_MODULE,
 	.release =	inet6_release,
 	.bind =		inet6_bind,
 	.connect =	inet_dgram_connect,		/* ok		*/
 	.socketpair =	sock_no_socketpair,		/* a do nothing	*/
 	.accept =	sock_no_accept,			/* a do nothing	*/
 	.getname =	inet6_getname,
 	.poll =		datagram_poll,			/* ok		*/
 	.ioctl =	inet6_ioctl,			/* must change  */
 	.listen =	sock_no_listen,			/* ok		*/
 	.shutdown =	inet_shutdown,			/* ok		*/
 	.setsockopt =	sock_common_setsockopt,		/* ok		*/
 	.getsockopt =	sock_common_getsockopt,		/* ok		*/
 	.sendmsg =	inet_sendmsg,			/* ok		*/
 	.recvmsg =	sock_common_recvmsg,		/* ok		*/
 	.mmap =		sock_no_mmap,
 	.sendpage =	sock_no_sendpage,
 };

 static struct inet_protosw rawv6_protosw = {
 	.type		= SOCK_RAW,
 	.protocol	= IPPROTO_IP,	/* wild card */
 	.prot		= &rawv6_prot,
 	.ops		= &inet6_sockraw_ops,
 	.capability	= CAP_NET_RAW,
 	.no_check	= UDP_CSUM_DEFAULT,
 	.flags		= INET_PROTOSW_REUSE,
 };

 void
 inet6_register_protosw(struct inet_protosw *p)
 {
 	struct list_head *lh;
 	struct inet_protosw *answer;
 	int protocol = p->protocol;
 	struct list_head *last_perm;

 	spin_lock_bh(&inetsw6_lock);

 	if (p->type >= SOCK_MAX)
 		goto out_illegal;

 	/* If we are trying to override a permanent protocol, bail. */
 	answer = NULL;
 	last_perm = &inetsw6[p->type];
 	list_for_each(lh, &inetsw6[p->type]) {
 		answer = list_entry(lh, struct inet_protosw, list);

 		/* Check only the non-wild match. */
 		if (INET_PROTOSW_PERMANENT & answer->flags) {
 			if (protocol == answer->protocol)
 				break;
 			last_perm = lh;
 		}

 		answer = NULL;
 	}
 	if (answer)
 		goto out_permanent;

 	/* Add the new entry after the last permanent entry if any, so that
 	 * the new entry does not override a permanent entry when matched with
 	 * a wild-card protocol. But it is allowed to override any existing
 	 * non-permanent entry.  This means that when we remove this entry, the
 	 * system automatically returns to the old behavior.
 	 */
 	list_add_rcu(&p->list, last_perm);
 out:
 	spin_unlock_bh(&inetsw6_lock);
 	return;

 out_permanent:
 	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
 	       protocol);
 	goto out;

 out_illegal:
 	printk(KERN_ERR
 	       "Ignoring attempt to register invalid socket type %d.\n",
 	       p->type);
 	goto out;
 }

 void
 inet6_unregister_protosw(struct inet_protosw *p)
 {
 	if (INET_PROTOSW_PERMANENT & p->flags) {
 		printk(KERN_ERR
 		       "Attempt to unregister permanent protocol %d.\n",
 		       p->protocol);
 	} else {
 		spin_lock_bh(&inetsw6_lock);
 		list_del_rcu(&p->list);
 		spin_unlock_bh(&inetsw6_lock);

 		synchronize_net();
 	}
 }

 int
 snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
 {
 	if (ptr == NULL)
 		return -EINVAL;

 	ptr[0] = __alloc_percpu(mibsize, mibalign);
 	if (!ptr[0])
 		goto err0;

 	ptr[1] = __alloc_percpu(mibsize, mibalign);
 	if (!ptr[1])
 		goto err1;

 	return 0;

 err1:
 	free_percpu(ptr[0]);
 	ptr[0] = NULL;
 err0:
 	return -ENOMEM;
 }

 void
 snmp6_mib_free(void *ptr[2])
 {
 	if (ptr == NULL)
 		return;
 	if (ptr[0])
 		free_percpu(ptr[0]);
 	if (ptr[1])
 		free_percpu(ptr[1]);
 	ptr[0] = ptr[1] = NULL;
 }

 static int __init init_ipv6_mibs(void)
 {
 	if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
 			   __alignof__(struct ipstats_mib)) < 0)
 		goto err_ip_mib;
 	if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
 			   __alignof__(struct icmpv6_mib)) < 0)
 		goto err_icmp_mib;
 	if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
 			   __alignof__(struct udp_mib)) < 0)
 		goto err_udp_mib;
 	return 0;

 err_udp_mib:
 	snmp6_mib_free((void **)icmpv6_statistics);
 err_icmp_mib:
 	snmp6_mib_free((void **)ipv6_statistics);
 err_ip_mib:
 	return -ENOMEM;

 }

 static void cleanup_ipv6_mibs(void)
 {
 	snmp6_mib_free((void **)ipv6_statistics);
 	snmp6_mib_free((void **)icmpv6_statistics);
 	snmp6_mib_free((void **)udp_stats_in6);
 }

 extern int ipv6_misc_proc_init(void);

 static int __init inet6_init(void)
 {
 	struct sk_buff *dummy_skb;
         struct list_head *r;
 	int err;

 #ifdef MODULE
 #if 0 /* FIXME --RR */
 	if (!mod_member_present(&__this_module, can_unload))
 	  return -EINVAL;

 	__this_module.can_unload = &ipv6_unload;
 #endif
 #endif

 	if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
 		printk(KERN_CRIT "inet6_proto_init: size fault\n");
 		return -EINVAL;
 	}

 	err = proto_register(&tcpv6_prot, 1);
 	if (err)
 		goto out;

 	err = proto_register(&udpv6_prot, 1);
 	if (err)
 		goto out_unregister_tcp_proto;

 	err = proto_register(&rawv6_prot, 1);
 	if (err)
 		goto out_unregister_udp_proto;


 	/* Register the socket-side information for inet6_create.  */
 	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
 		INIT_LIST_HEAD(r);

 	/* We MUST register RAW sockets before we create the ICMP6,
 	 * IGMP6, or NDISC control sockets.
 	 */
 	inet6_register_protosw(&rawv6_protosw);

 	/* Register the family here so that the init calls below will
 	 * be able to create sockets. (?? is this dangerous ??)
 	 */
 	(void) sock_register(&inet6_family_ops);

 	/* Initialise ipv6 mibs */
 	err = init_ipv6_mibs();
 	if (err)
 		goto out_unregister_raw_proto;

 	/*
 	 *	ipngwg API draft makes clear that the correct semantics
 	 *	for TCP and UDP is to consider one TCP and UDP instance
 	 *	in a host availiable by both INET and INET6 APIs and
 	 *	able to communicate via both network protocols.
 	 */

 #ifdef CONFIG_SYSCTL
 	ipv6_sysctl_register();
 #endif
 	err = icmpv6_init(&inet6_family_ops);
 	if (err)
 		goto icmp_fail;
 	err = ndisc_init(&inet6_family_ops);
 	if (err)
 		goto ndisc_fail;
 	err = igmp6_init(&inet6_family_ops);
 	if (err)
 		goto igmp_fail;
 	/* Create /proc/foo6 entries. */
 #ifdef CONFIG_PROC_FS
 	err = -ENOMEM;
 	if (raw6_proc_init())
 		goto proc_raw6_fail;
 	if (tcp6_proc_init())
 		goto proc_tcp6_fail;
 	if (udp6_proc_init())
 		goto proc_udp6_fail;
 	if (ipv6_misc_proc_init())
 		goto proc_misc6_fail;

 	if (ac6_proc_init())
 		goto proc_anycast6_fail;
 	if (if6_proc_init())
 		goto proc_if6_fail;
 #endif
 	ipv6_packet_init();
 	ip6_route_init();
 	ip6_flowlabel_init();
 	err = addrconf_init();
 	if (err)
 		goto addrconf_fail;
 	sit_init();

 	/* Init v6 extension headers. */
 	ipv6_rthdr_init();
 	ipv6_frag_init();
 	ipv6_nodata_init();
 	ipv6_destopt_init();

 	/* Init v6 transport protocols. */
 	udpv6_init();
 	tcpv6_init();
 	err = 0;
 out:
 	return err;

 addrconf_fail:
 	ip6_flowlabel_cleanup();
 	ip6_route_cleanup();
 	ipv6_packet_cleanup();
 #ifdef CONFIG_PROC_FS
 	if6_proc_exit();
 proc_if6_fail:
 	ac6_proc_exit();
 proc_anycast6_fail:
 	ipv6_misc_proc_exit();
 proc_misc6_fail:
 	udp6_proc_exit();
 proc_udp6_fail:
 	tcp6_proc_exit();
 proc_tcp6_fail:
 	raw6_proc_exit();
 proc_raw6_fail:
 #endif
 	igmp6_cleanup();
 igmp_fail:
 	ndisc_cleanup();
 ndisc_fail:
 	icmpv6_cleanup();
 icmp_fail:
 #ifdef CONFIG_SYSCTL
 	ipv6_sysctl_unregister();
 #endif
 	cleanup_ipv6_mibs();
 out_unregister_raw_proto:
 	proto_unregister(&rawv6_prot);
 out_unregister_udp_proto:
 	proto_unregister(&udpv6_prot);
 out_unregister_tcp_proto:
 	proto_unregister(&tcpv6_prot);
 	goto out;
 }
 module_init(inet6_init);

 static void __exit inet6_exit(void)
 {
 	/* First of all disallow new sockets creation. */
 	sock_unregister(PF_INET6);
 #ifdef CONFIG_PROC_FS
 	if6_proc_exit();
 	ac6_proc_exit();
  	ipv6_misc_proc_exit();
  	udp6_proc_exit();
  	tcp6_proc_exit();
  	raw6_proc_exit();
 #endif
 	/* Cleanup code parts. */
 	sit_cleanup();
 	ip6_flowlabel_cleanup();
 	addrconf_cleanup();
 	ip6_route_cleanup();
 	ipv6_packet_cleanup();
 	igmp6_cleanup();
 	ndisc_cleanup();
 	icmpv6_cleanup();
 #ifdef CONFIG_SYSCTL
 	ipv6_sysctl_unregister();
 #endif
 	cleanup_ipv6_mibs();
 	proto_unregister(&rawv6_prot);
 	proto_unregister(&udpv6_prot);
 	proto_unregister(&tcpv6_prot);
 }
 module_exit(inet6_exit);

 MODULE_ALIAS_NETPROTO(PF_INET6);
	/*
	* PF_INET6 socket protocol family
	* Linux INET6 implementation
	*
	* Authors:
	* Pedro Roque <roque@di.fc.ul.pt>
	*
	* Adapted from linux/net/ipv4/af_inet.c
	*
	* $Id: af_inet6.c,v 1.66 2002/02/01 22:01:04 davem Exp $
	*
	* Fixes:
	* piggy, Karl Knutson : Socket protocol table
	* Hideaki YOSHIFUJI : sin6_scope_id support
	* Arnaldo Melo : check proc_net_create return, cleanups
	*
	* This program is free software; you can redistribute it and/or
	* modify it under the terms of the GNU General Public License
	* as published by the Free Software Foundation; either version
	* 2 of the License, or (at your option) any later version.
	*/


	#include <linux/module.h>
	#include <linux/config.h>
	#include <linux/errno.h>
	#include <linux/types.h>
	#include <linux/socket.h>
	#include <linux/in.h>
	#include <linux/kernel.h>
	#include <linux/sched.h>
	#include <linux/timer.h>
	#include <linux/string.h>
	#include <linux/sockios.h>
	#include <linux/net.h>
	#include <linux/fcntl.h>
	#include <linux/mm.h>
	#include <linux/interrupt.h>
	#include <linux/proc_fs.h>
	#include <linux/stat.h>
	#include <linux/init.h>

	#include <linux/inet.h>
	#include <linux/netdevice.h>
	#include <linux/icmpv6.h>
	#include <linux/smp_lock.h>

	#include <net/ip.h>
	#include <net/ipv6.h>
	#include <net/udp.h>
	#include <net/tcp.h>
	#include <net/ipip.h>
	#include <net/protocol.h>
	#include <net/inet_common.h>
	#include <net/transp_v6.h>
	#include <net/ip6_route.h>
	#include <net/addrconf.h>
	#ifdef CONFIG_IPV6_TUNNEL
	#include <net/ip6_tunnel.h>
	#endif

	#include <asm/uaccess.h>
	#include <asm/system.h>

	MODULE_AUTHOR("Cast of dozens");
	MODULE_DESCRIPTION("IPv6 protocol stack for Linux");
	MODULE_LICENSE("GPL");

	/* IPv6 procfs goodies... */

	#ifdef CONFIG_PROC_FS
	extern int raw6_proc_init(void);
	extern void raw6_proc_exit(void);
	extern int tcp6_proc_init(void);
	extern void tcp6_proc_exit(void);
	extern int udp6_proc_init(void);
	extern void udp6_proc_exit(void);
	extern int ipv6_misc_proc_init(void);
	extern void ipv6_misc_proc_exit(void);
	extern int ac6_proc_init(void);
	extern void ac6_proc_exit(void);
	extern int if6_proc_init(void);
	extern void if6_proc_exit(void);
	#endif

	int sysctl_ipv6_bindv6only;

	#ifdef INET_REFCNT_DEBUG
	atomic_t inet6_sock_nr;
	EXPORT_SYMBOL(inet6_sock_nr);
	#endif

	/* The inetsw table contains everything that inet_create needs to
	* build a new socket.
	*/
	static struct list_head inetsw6[SOCK_MAX];
	static DEFINE_SPINLOCK(inetsw6_lock);

	static void inet6_sock_destruct(struct sock *sk)
	{
	inet_sock_destruct(sk);

	#ifdef INET_REFCNT_DEBUG
	atomic_dec(&inet6_sock_nr);
	#endif
	}

	static __inline__ struct ipv6_pinfo inet6_sk_generic(struct sock sk)
	{
	const int offset = sk->sk_prot->obj_size - sizeof(struct ipv6_pinfo);

	return (struct ipv6_pinfo )(((u8 )sk) + offset);
	}

	static int inet6_create(struct socket *sock, int protocol)
	{
	struct inet_sock *inet;
	struct ipv6_pinfo *np;
	struct sock *sk;
	struct list_head *p;
	struct inet_protosw *answer;
	struct proto *answer_prot;
	unsigned char answer_flags;
	char answer_no_check;
	int rc;

	/* Look for the requested type/protocol pair. */
	answer = NULL;
	rcu_read_lock();
	list_for_each_rcu(p, &inetsw6[sock->type]) {
	answer = list_entry(p, struct inet_protosw, list);

	/* Check the non-wild match. */
	if (protocol == answer->protocol) {
	if (protocol != IPPROTO_IP)
	break;
	} else {
	/* Check for the two wild cases. */
	if (IPPROTO_IP == protocol) {
	protocol = answer->protocol;
	break;
	}
	if (IPPROTO_IP == answer->protocol)
	break;
	}
	answer = NULL;
	}

	rc = -ESOCKTNOSUPPORT;
	if (!answer)
	goto out_rcu_unlock;
	rc = -EPERM;
	if (answer->capability > 0 && !capable(answer->capability))
	goto out_rcu_unlock;
	rc = -EPROTONOSUPPORT;
	if (!protocol)
	goto out_rcu_unlock;

	sock->ops = answer->ops;

	answer_prot = answer->prot;
	answer_no_check = answer->no_check;
	answer_flags = answer->flags;
	rcu_read_unlock();

	BUG_TRAP(answer_prot->slab != NULL);

	rc = -ENOBUFS;
	sk = sk_alloc(PF_INET6, GFP_KERNEL, answer_prot, 1);
	if (sk == NULL)
	goto out;

	sock_init_data(sock, sk);

	rc = 0;
	sk->sk_no_check = answer_no_check;
	if (INET_PROTOSW_REUSE & answer_flags)
	sk->sk_reuse = 1;

	inet = inet_sk(sk);

	if (SOCK_RAW == sock->type) {
	inet->num = protocol;
	if (IPPROTO_RAW == protocol)
	inet->hdrincl = 1;
	}

	sk->sk_destruct = inet6_sock_destruct;
	sk->sk_family = PF_INET6;
	sk->sk_protocol = protocol;

	sk->sk_backlog_rcv = answer->prot->backlog_rcv;

	inet_sk(sk)->pinet6 = np = inet6_sk_generic(sk);
	np->hop_limit = -1;
	np->mcast_hops = -1;
	np->mc_loop = 1;
	np->pmtudisc = IPV6_PMTUDISC_WANT;
	np->ipv6only = sysctl_ipv6_bindv6only;

	/* Init the ipv4 part of the socket since we can have sockets
	* using v6 API for ipv4.
	*/
	inet->uc_ttl = -1;

	inet->mc_loop = 1;
	inet->mc_ttl = 1;
	inet->mc_index = 0;
	inet->mc_list = NULL;

	if (ipv4_config.no_pmtu_disc)
	inet->pmtudisc = IP_PMTUDISC_DONT;
	else
	inet->pmtudisc = IP_PMTUDISC_WANT;


	#ifdef INET_REFCNT_DEBUG
	atomic_inc(&inet6_sock_nr);
	atomic_inc(&inet_sock_nr);
	#endif
	if (inet->num) {
	/* It assumes that any protocol which allows
	* the user to assign a number at socket
	* creation time automatically shares.
	*/
	inet->sport = ntohs(inet->num);
	sk->sk_prot->hash(sk);
	}
	if (sk->sk_prot->init) {
	rc = sk->sk_prot->init(sk);
	if (rc) {
	sk_common_release(sk);
	goto out;
	}
	}
	out:
	return rc;
	out_rcu_unlock:
	rcu_read_unlock();
	goto out;
	}


	/* bind for INET6 API */
	int inet6_bind(struct socket sock, struct sockaddr uaddr, int addr_len)
	{
	struct sockaddr_in6 addr=(struct sockaddr_in6 )uaddr;
	struct sock *sk = sock->sk;
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);
	__u32 v4addr = 0;
	unsigned short snum;
	int addr_type = 0;
	int err = 0;

	/* If the socket has its own bind function then use it. */
	if (sk->sk_prot->bind)
	return sk->sk_prot->bind(sk, uaddr, addr_len);

	if (addr_len < SIN6_LEN_RFC2133)
	return -EINVAL;
	addr_type = ipv6_addr_type(&addr->sin6_addr);
	if ((addr_type & IPV6_ADDR_MULTICAST) && sock->type == SOCK_STREAM)
	return -EINVAL;

	snum = ntohs(addr->sin6_port);
	if (snum && snum < PROT_SOCK && !capable(CAP_NET_BIND_SERVICE))
	return -EACCES;

	lock_sock(sk);

	/* Check these errors (active socket, double bind). */
	if (sk->sk_state != TCP_CLOSE \|\| inet->num) {
	err = -EINVAL;
	goto out;
	}

	/* Check if the address belongs to the host. */
	if (addr_type == IPV6_ADDR_MAPPED) {
	v4addr = addr->sin6_addr.s6_addr32[3];
	if (inet_addr_type(v4addr) != RTN_LOCAL) {
	err = -EADDRNOTAVAIL;
	goto out;
	}
	} else {
	if (addr_type != IPV6_ADDR_ANY) {
	struct net_device *dev = NULL;

	if (addr_type & IPV6_ADDR_LINKLOCAL) {
	if (addr_len >= sizeof(struct sockaddr_in6) &&
	addr->sin6_scope_id) {
	/* Override any existing binding, if another one
	* is supplied by user.
	*/
	sk->sk_bound_dev_if = addr->sin6_scope_id;
	}

	/* Binding to link-local address requires an interface */
	if (!sk->sk_bound_dev_if) {
	err = -EINVAL;
	goto out;
	}
	dev = dev_get_by_index(sk->sk_bound_dev_if);
	if (!dev) {
	err = -ENODEV;
	goto out;
	}
	}

	/* ipv4 addr of the socket is invalid. Only the
	* unspecified and mapped address have a v4 equivalent.
	*/
	v4addr = LOOPBACK4_IPV6;
	if (!(addr_type & IPV6_ADDR_MULTICAST)) {
	if (!ipv6_chk_addr(&addr->sin6_addr, dev, 0)) {
	if (dev)
	dev_put(dev);
	err = -EADDRNOTAVAIL;
	goto out;
	}
	}
	if (dev)
	dev_put(dev);
	}
	}

	inet->rcv_saddr = v4addr;
	inet->saddr = v4addr;

	ipv6_addr_copy(&np->rcv_saddr, &addr->sin6_addr);

	if (!(addr_type & IPV6_ADDR_MULTICAST))
	ipv6_addr_copy(&np->saddr, &addr->sin6_addr);

	/* Make sure we are allowed to bind here. */
	if (sk->sk_prot->get_port(sk, snum)) {
	inet_reset_saddr(sk);
	err = -EADDRINUSE;
	goto out;
	}

	if (addr_type != IPV6_ADDR_ANY)
	sk->sk_userlocks \|= SOCK_BINDADDR_LOCK;
	if (snum)
	sk->sk_userlocks \|= SOCK_BINDPORT_LOCK;
	inet->sport = ntohs(inet->num);
	inet->dport = 0;
	inet->daddr = 0;
	out:
	release_sock(sk);
	return err;
	}

	int inet6_release(struct socket *sock)
	{
	struct sock *sk = sock->sk;

	if (sk == NULL)
	return -EINVAL;

	/* Free mc lists */
	ipv6_sock_mc_close(sk);

	/* Free ac lists */
	ipv6_sock_ac_close(sk);

	return inet_release(sock);
	}

	int inet6_destroy_sock(struct sock *sk)
	{
	struct ipv6_pinfo *np = inet6_sk(sk);
	struct sk_buff *skb;
	struct ipv6_txoptions *opt;

	/*
	* Release destination entry
	*/

	sk_dst_reset(sk);

	/* Release rx options */

	if ((skb = xchg(&np->pktoptions, NULL)) != NULL)
	kfree_skb(skb);

	/* Free flowlabels */
	fl6_free_socklist(sk);

	/* Free tx options */

	if ((opt = xchg(&np->opt, NULL)) != NULL)
	sock_kfree_s(sk, opt, opt->tot_len);

	return 0;
	}

	/*
	* This does both peername and sockname.
	*/

	int inet6_getname(struct socket sock, struct sockaddr uaddr,
	int *uaddr_len, int peer)
	{
	struct sockaddr_in6 sin=(struct sockaddr_in6 )uaddr;
	struct sock *sk = sock->sk;
	struct inet_sock *inet = inet_sk(sk);
	struct ipv6_pinfo *np = inet6_sk(sk);

	sin->sin6_family = AF_INET6;
	sin->sin6_flowinfo = 0;
	sin->sin6_scope_id = 0;
	if (peer) {
	if (!inet->dport)
	return -ENOTCONN;
	if (((1 << sk->sk_state) & (TCPF_CLOSE \| TCPF_SYN_SENT)) &&
	peer == 1)
	return -ENOTCONN;
	sin->sin6_port = inet->dport;
	ipv6_addr_copy(&sin->sin6_addr, &np->daddr);
	if (np->sndflow)
	sin->sin6_flowinfo = np->flow_label;
	} else {
	if (ipv6_addr_any(&np->rcv_saddr))
	ipv6_addr_copy(&sin->sin6_addr, &np->saddr);
	else
	ipv6_addr_copy(&sin->sin6_addr, &np->rcv_saddr);

	sin->sin6_port = inet->sport;
	}
	if (ipv6_addr_type(&sin->sin6_addr) & IPV6_ADDR_LINKLOCAL)
	sin->sin6_scope_id = sk->sk_bound_dev_if;
	uaddr_len = sizeof(sin);
	return(0);
	}

	int inet6_ioctl(struct socket *sock, unsigned int cmd, unsigned long arg)
	{
	struct sock *sk = sock->sk;
	int err = -EINVAL;

	switch(cmd)
	{
	case SIOCGSTAMP:
	return sock_get_timestamp(sk, (struct timeval __user *)arg);

	case SIOCADDRT:
	case SIOCDELRT:

	return(ipv6_route_ioctl(cmd,(void __user *)arg));

	case SIOCSIFADDR:
	return addrconf_add_ifaddr((void __user *) arg);
	case SIOCDIFADDR:
	return addrconf_del_ifaddr((void __user *) arg);
	case SIOCSIFDSTADDR:
	return addrconf_set_dstaddr((void __user *) arg);
	default:
	if (!sk->sk_prot->ioctl \|\|
	(err = sk->sk_prot->ioctl(sk, cmd, arg)) == -ENOIOCTLCMD)
	return(dev_ioctl(cmd,(void __user *) arg));
	return err;
	}
	/NOTREACHED/
	return(0);
	}

	struct proto_ops inet6_stream_ops = {
	.family = PF_INET6,
	.owner = THIS_MODULE,
	.release = inet6_release,
	.bind = inet6_bind,
	.connect = inet_stream_connect, /* ok */
	.socketpair = sock_no_socketpair, /* a do nothing */
	.accept = inet_accept, /* ok */
	.getname = inet6_getname,
	.poll = tcp_poll, /* ok */
	.ioctl = inet6_ioctl, /* must change */
	.listen = inet_listen, /* ok */
	.shutdown = inet_shutdown, /* ok */
	.setsockopt = sock_common_setsockopt, /* ok */
	.getsockopt = sock_common_getsockopt, /* ok */
	.sendmsg = inet_sendmsg, /* ok */
	.recvmsg = sock_common_recvmsg, /* ok */
	.mmap = sock_no_mmap,
	.sendpage = tcp_sendpage
	};

	struct proto_ops inet6_dgram_ops = {
	.family = PF_INET6,
	.owner = THIS_MODULE,
	.release = inet6_release,
	.bind = inet6_bind,
	.connect = inet_dgram_connect, /* ok */
	.socketpair = sock_no_socketpair, /* a do nothing */
	.accept = sock_no_accept, /* a do nothing */
	.getname = inet6_getname,
	.poll = udp_poll, /* ok */
	.ioctl = inet6_ioctl, /* must change */
	.listen = sock_no_listen, /* ok */
	.shutdown = inet_shutdown, /* ok */
	.setsockopt = sock_common_setsockopt, /* ok */
	.getsockopt = sock_common_getsockopt, /* ok */
	.sendmsg = inet_sendmsg, /* ok */
	.recvmsg = sock_common_recvmsg, /* ok */
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
	};

	static struct net_proto_family inet6_family_ops = {
	.family = PF_INET6,
	.create = inet6_create,
	.owner = THIS_MODULE,
	};

	#ifdef CONFIG_SYSCTL
	extern void ipv6_sysctl_register(void);
	extern void ipv6_sysctl_unregister(void);
	#endif

	/* Same as inet6_dgram_ops, sans udp_poll. */
	static struct proto_ops inet6_sockraw_ops = {
	.family = PF_INET6,
	.owner = THIS_MODULE,
	.release = inet6_release,
	.bind = inet6_bind,
	.connect = inet_dgram_connect, /* ok */
	.socketpair = sock_no_socketpair, /* a do nothing */
	.accept = sock_no_accept, /* a do nothing */
	.getname = inet6_getname,
	.poll = datagram_poll, /* ok */
	.ioctl = inet6_ioctl, /* must change */
	.listen = sock_no_listen, /* ok */
	.shutdown = inet_shutdown, /* ok */
	.setsockopt = sock_common_setsockopt, /* ok */
	.getsockopt = sock_common_getsockopt, /* ok */
	.sendmsg = inet_sendmsg, /* ok */
	.recvmsg = sock_common_recvmsg, /* ok */
	.mmap = sock_no_mmap,
	.sendpage = sock_no_sendpage,
	};

	static struct inet_protosw rawv6_protosw = {
	.type = SOCK_RAW,
	.protocol = IPPROTO_IP, /* wild card */
	.prot = &rawv6_prot,
	.ops = &inet6_sockraw_ops,
	.capability = CAP_NET_RAW,
	.no_check = UDP_CSUM_DEFAULT,
	.flags = INET_PROTOSW_REUSE,
	};

	void
	inet6_register_protosw(struct inet_protosw *p)
	{
	struct list_head *lh;
	struct inet_protosw *answer;
	int protocol = p->protocol;
	struct list_head *last_perm;

	spin_lock_bh(&inetsw6_lock);

	if (p->type >= SOCK_MAX)
	goto out_illegal;

	/* If we are trying to override a permanent protocol, bail. */
	answer = NULL;
	last_perm = &inetsw6[p->type];
	list_for_each(lh, &inetsw6[p->type]) {
	answer = list_entry(lh, struct inet_protosw, list);

	/* Check only the non-wild match. */
	if (INET_PROTOSW_PERMANENT & answer->flags) {
	if (protocol == answer->protocol)
	break;
	last_perm = lh;
	}

	answer = NULL;
	}
	if (answer)
	goto out_permanent;

	/* Add the new entry after the last permanent entry if any, so that
	* the new entry does not override a permanent entry when matched with
	* a wild-card protocol. But it is allowed to override any existing
	* non-permanent entry. This means that when we remove this entry, the
	* system automatically returns to the old behavior.
	*/
	list_add_rcu(&p->list, last_perm);
	out:
	spin_unlock_bh(&inetsw6_lock);
	return;

	out_permanent:
	printk(KERN_ERR "Attempt to override permanent protocol %d.\n",
	protocol);
	goto out;

	out_illegal:
	printk(KERN_ERR
	"Ignoring attempt to register invalid socket type %d.\n",
	p->type);
	goto out;
	}

	void
	inet6_unregister_protosw(struct inet_protosw *p)
	{
	if (INET_PROTOSW_PERMANENT & p->flags) {
	printk(KERN_ERR
	"Attempt to unregister permanent protocol %d.\n",
	p->protocol);
	} else {
	spin_lock_bh(&inetsw6_lock);
	list_del_rcu(&p->list);
	spin_unlock_bh(&inetsw6_lock);

	synchronize_net();
	}
	}

	int
	snmp6_mib_init(void *ptr[2], size_t mibsize, size_t mibalign)
	{
	if (ptr == NULL)
	return -EINVAL;

	ptr[0] = __alloc_percpu(mibsize, mibalign);
	if (!ptr[0])
	goto err0;

	ptr[1] = __alloc_percpu(mibsize, mibalign);
	if (!ptr[1])
	goto err1;

	return 0;

	err1:
	free_percpu(ptr[0]);
	ptr[0] = NULL;
	err0:
	return -ENOMEM;
	}

	void
	snmp6_mib_free(void *ptr[2])
	{
	if (ptr == NULL)
	return;
	if (ptr[0])
	free_percpu(ptr[0]);
	if (ptr[1])
	free_percpu(ptr[1]);
	ptr[0] = ptr[1] = NULL;
	}

	static int __init init_ipv6_mibs(void)
	{
	if (snmp6_mib_init((void **)ipv6_statistics, sizeof (struct ipstats_mib),
	__alignof__(struct ipstats_mib)) < 0)
	goto err_ip_mib;
	if (snmp6_mib_init((void **)icmpv6_statistics, sizeof (struct icmpv6_mib),
	__alignof__(struct icmpv6_mib)) < 0)
	goto err_icmp_mib;
	if (snmp6_mib_init((void **)udp_stats_in6, sizeof (struct udp_mib),
	__alignof__(struct udp_mib)) < 0)
	goto err_udp_mib;
	return 0;

	err_udp_mib:
	snmp6_mib_free((void **)icmpv6_statistics);
	err_icmp_mib:
	snmp6_mib_free((void **)ipv6_statistics);
	err_ip_mib:
	return -ENOMEM;

	}

	static void cleanup_ipv6_mibs(void)
	{
	snmp6_mib_free((void **)ipv6_statistics);
	snmp6_mib_free((void **)icmpv6_statistics);
	snmp6_mib_free((void **)udp_stats_in6);
	}

	extern int ipv6_misc_proc_init(void);

	static int __init inet6_init(void)
	{
	struct sk_buff *dummy_skb;
	struct list_head *r;
	int err;

	#ifdef MODULE
	#if 0 /* FIXME --RR */
	if (!mod_member_present(&__this_module, can_unload))
	return -EINVAL;

	__this_module.can_unload = &ipv6_unload;
	#endif
	#endif

	if (sizeof(struct inet6_skb_parm) > sizeof(dummy_skb->cb)) {
	printk(KERN_CRIT "inet6_proto_init: size fault\n");
	return -EINVAL;
	}

	err = proto_register(&tcpv6_prot, 1);
	if (err)
	goto out;

	err = proto_register(&udpv6_prot, 1);
	if (err)
	goto out_unregister_tcp_proto;

	err = proto_register(&rawv6_prot, 1);
	if (err)
	goto out_unregister_udp_proto;


	/* Register the socket-side information for inet6_create. */
	for(r = &inetsw6[0]; r < &inetsw6[SOCK_MAX]; ++r)
	INIT_LIST_HEAD(r);

	/* We MUST register RAW sockets before we create the ICMP6,
	* IGMP6, or NDISC control sockets.
	*/
	inet6_register_protosw(&rawv6_protosw);

	/* Register the family here so that the init calls below will
	* be able to create sockets. (?? is this dangerous ??)
	*/
	(void) sock_register(&inet6_family_ops);

	/* Initialise ipv6 mibs */
	err = init_ipv6_mibs();
	if (err)
	goto out_unregister_raw_proto;

	/*
	* ipngwg API draft makes clear that the correct semantics
	* for TCP and UDP is to consider one TCP and UDP instance
	* in a host availiable by both INET and INET6 APIs and
	* able to communicate via both network protocols.
	*/

	#ifdef CONFIG_SYSCTL
	ipv6_sysctl_register();
	#endif
	err = icmpv6_init(&inet6_family_ops);
	if (err)
	goto icmp_fail;
	err = ndisc_init(&inet6_family_ops);
	if (err)
	goto ndisc_fail;
	err = igmp6_init(&inet6_family_ops);
	if (err)
	goto igmp_fail;
	/* Create /proc/foo6 entries. */
	#ifdef CONFIG_PROC_FS
	err = -ENOMEM;
	if (raw6_proc_init())
	goto proc_raw6_fail;
	if (tcp6_proc_init())
	goto proc_tcp6_fail;
	if (udp6_proc_init())
	goto proc_udp6_fail;
	if (ipv6_misc_proc_init())
	goto proc_misc6_fail;

	if (ac6_proc_init())
	goto proc_anycast6_fail;
	if (if6_proc_init())
	goto proc_if6_fail;
	#endif
	ipv6_packet_init();
	ip6_route_init();
	ip6_flowlabel_init();
	err = addrconf_init();
	if (err)
	goto addrconf_fail;
	sit_init();

	/* Init v6 extension headers. */
	ipv6_rthdr_init();
	ipv6_frag_init();
	ipv6_nodata_init();
	ipv6_destopt_init();

	/* Init v6 transport protocols. */
	udpv6_init();
	tcpv6_init();
	err = 0;
	out:
	return err;

	addrconf_fail:
	ip6_flowlabel_cleanup();
	ip6_route_cleanup();
	ipv6_packet_cleanup();
	#ifdef CONFIG_PROC_FS
	if6_proc_exit();
	proc_if6_fail:
	ac6_proc_exit();
	proc_anycast6_fail:
	ipv6_misc_proc_exit();
	proc_misc6_fail:
	udp6_proc_exit();
	proc_udp6_fail:
	tcp6_proc_exit();
	proc_tcp6_fail:
	raw6_proc_exit();
	proc_raw6_fail:
	#endif
	igmp6_cleanup();
	igmp_fail:
	ndisc_cleanup();
	ndisc_fail:
	icmpv6_cleanup();
	icmp_fail:
	#ifdef CONFIG_SYSCTL
	ipv6_sysctl_unregister();
	#endif
	cleanup_ipv6_mibs();
	out_unregister_raw_proto:
	proto_unregister(&rawv6_prot);
	out_unregister_udp_proto:
	proto_unregister(&udpv6_prot);
	out_unregister_tcp_proto:
	proto_unregister(&tcpv6_prot);
	goto out;
	}
	module_init(inet6_init);

	static void __exit inet6_exit(void)
	{
	/* First of all disallow new sockets creation. */
	sock_unregister(PF_INET6);
	#ifdef CONFIG_PROC_FS
	if6_proc_exit();
	ac6_proc_exit();
	ipv6_misc_proc_exit();
	udp6_proc_exit();
	tcp6_proc_exit();
	raw6_proc_exit();
	#endif
	/* Cleanup code parts. */
	sit_cleanup();
	ip6_flowlabel_cleanup();
	addrconf_cleanup();
	ip6_route_cleanup();
	ipv6_packet_cleanup();
	igmp6_cleanup();
	ndisc_cleanup();
	icmpv6_cleanup();
	#ifdef CONFIG_SYSCTL
	ipv6_sysctl_unregister();
	#endif
	cleanup_ipv6_mibs();
	proto_unregister(&rawv6_prot);
	proto_unregister(&udpv6_prot);
	proto_unregister(&tcpv6_prot);
	}
	module_exit(inet6_exit);

	MODULE_ALIAS_NETPROTO(PF_INET6);